System, method, and computer program for superposition coded multicast with a single modulation scheme

a computer program and superposition code technology, applied in the field of wireless communication, can solve the problems of poor economic scale, lack of dedicated hardware and software support, and inability to select a proper transmission rate,
US20110222462A1Inactive Publication Date: 2011-09-15HO PIN HAN +1
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
HO PIN HAN
Publication Date
2011-09-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

A cross-layer design architecture is provided for logical superposition coded (SPC) modulation for last-hop wireless data, aiming to overcome the effects of multi-user channel diversity in wireless video multicast. The proposed approach generates a logical SPC modulated signal by mapping successively refined information bits onto layered modulation through dynamic energy allocation and phase keying assignment, which mimics the superposition process for multiple modulated signals in convention hardware-based SPC modulation. At the receiver end, the received logical SPC signal is decoded by implementing a software-based approach on common demodulators without going through the signal-interference cancellation (SIC) process that is necessary in the conventional approach. The approach presented provides comparable or even better overall system throughput than by using the conventional hardware and SIC-based SPC modulation under various scenarios of different histograms of user channel conditions and power allocations for base and enhancement layer information.
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Description

FIELD OF THE INVENTION

[0001] The present invention relates generally to wireless communication, and more specifically to techniques for enabling wireless data multicasting requiring minimal hardware modifications to a transmitter and requiring no hardware modifications to a receiver.BACKGROUND TO THE INVENTION

[0002] Multicasting or sharing a transmitted signal with information among a group of receivers who are interested in the same content (e.g. data, video, audio, etc.) is generally an effective and scalable way to deliver bandwidth-intensive data in wireless or even wired infrastructure because duplicated deliveries of the same copy of data can be prevented.

[0003] Unprecedented advancements in wireless broadband access technologies based on IEEE 802.16 (WiMAX) standards and scalable video coding technologies, such as H.264 / MPEG4 Advanced Video Coding (AVC), have made it possible for provisioning large-scale wireless video multicast / broadcast services, such as mobile Internet Protoc...

Claims

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